People might call it surreal when they see this phenomenon for the first time. A hidden light which ignites around the acidic lake. This blue fire peeps out through toxic gases. It is adorable to see but people need to know that it is perilous on the other hand.
Blue fire is only visible in the dark around 02:00 to 04:30 a.m. or right before the sun rises. It is caused by its high consentration of sulphur gases (H²S) and high temperature and pressure from several volcanic cracks near the acidic lake. The temperature reaches over 600°C. This combustion emerges when the hot gases meet the air which is cooler, resulting the blue flame phenomenon. The condensed sulphur gases also burn up, making the liquid sulphur emits blue fire as well.
Visitors must start hiking Ijen Crater at 2 a.m. to see this rare phenomenon just to make sure that they will not be late to see it. However, people need to know that if they want to go down to see blue fire, they have to realise that they are walking down a crater of an active volcano and reaching out its fumarole. A fumarole is a vent in the Earth's surface from which steam and volcanic gases are emitted. Wearing gas masks is extremely needed. People still need to be careful and think about the risks.
